Stop-cock.



No.8'71,956. PATENTED NOV. 26, 1907. R. RICE.

STOP 000K.

APPLIoATIoN FILED ooT.s,19o4.

UNITED STATES PATENT OFFICE.

ROBERT RICE, OF DETROIT, MICHIGAN, ASSIGNOR OF ONE-HALF TOl GEORGESTROH, OF

DETROIT,

MICHIGAN.

STOP-COCK.

Specification of Letters Patent.

Patented Nov. 26, 1907.

To all whom it may concern.:

Be it known that I, RoBnnT Rien, a citizen of the United States oi'America, residing at Detroit, in the county of Wayne and State ofMichigan, have invented certain new and useful Improvements in Stop-Cocks, of which the following is a specification, reference being hadtherein to the accom anying drawings.

T iis invention relates to that class of stop cocks especially designedfor use in connection with pressure appliances as for instance as ablow-ell" for boilers or throttle valve for engines etc., and the objectof the invention is to produce a stop cock for these pu oses which isnot liable to leak orpbecome eaky under any pressure or contingencies ofuse, and which at the same time can be opened and closed without theexpenditure of much power, all of which I obtain by the constructionmore fully hereinafter described and shown in the accompanying drawings,in which Figure l is a. central section through the stop cock, and F ig.2, is a top plan of the plug. F ig. 3 is a vertical section through theupper end of the'valve stem.

A is the casiniT formed with a frustoconical plug cham er in which isseated the hollow tapered rotary plug B. The casing is provided in theaxis of the plug with an inlet opening C formed through a suit-ablecoupling arm D atl the smaller end of the plug and with one or moreoutlet openings V formed by like' cou lingl arms E at right angles tothe axis of t e plug. The interior chamber G of the plug is o en to theinlet, and is adapted to connect t e-same through a lateral opening H inthe wall of the lug with either one of the outlets shown. he plug isshorter than the chamber inwhieh 1t is seated which leaves at the largerend of the lug a pressure chamber I which cornmunicates with the chamberin the plug and thereby With the inlet through ports a formed throughthe closed end of the plug.

The top of the plugchamber is formed by a ca -J which is connected tothe valve casing y screw threads as shown, but may be secured to thecasin y by bolts in the larger sizes of the cock an( a pressure tightjoint isformed by nieansof an annular vflange b prfjecting from the-underside of the cap an fitting tightly into a corresponding I groovein the casing. The plug is formed in its closedend with a square recessK for engagement (with the stem L which has a correspondingly sc uaredinner end to iit into the recess an( a squared outer end c to receive asuitable lever or other turning device.

The stem passes through a packing-gland d formed on the cap and adaptedto receive a packin e. which is held in place by a packing nut Anothersteam tight joint is formed around the stem by means of a projectingbevel flange N encircling the stem and seated upon a corresponding bevelseat on the underside of the cap around the stem by the tension of acoil spring O inclosed within a recess P in the inner end of the stem,'the lange N and its seat being ground telit each other and form apressure tight joint.

The recess P in the stem is provided with ports f throu h which itcommunicates with the chamber on top of the' plug and a passage Rleadsfrom the recess to the outer end of the stem and forms a secondaryoutlet. This outlet may be utilized for different urp`oses accordingtothe specific use to W 'ch the stop cock may be put to. In using it asa boiler blow-off cock, I attach a common pet cock to the outlet asshown in dotted ines in the drawings by providin the stem with anexternally screw-threade nipple S, which permits. of blowing off any mudor itty substance which may have accumuated in the passages of the cockthereby preventing it from grinding out the plug or its seat inoperating the cock. If not used for this or any other purpose it mayreadily be closed by a screw cap and any other unused outlet from thecasing may be provided with a screw-plug, as shown in dotted lines.

It Wil be understood thatA the pressure of the iluid on the valve plugis the same on the upper and lower side thereof Whether the cock isclosed or not. The pressure of the fluid is thus no factor at all in theseating of the valve and the force which holds it to its seaty dependswholly on the tension of the spring and on the weight of the plug and itturns therefore just as easy with higlh as with low ressure. The tensionof t e spring the plug to its seat at the different positions in whichit may be used an may Whic is xed need only be sufficient to keep les orsmall factor in considering the force required joints between forturning the valve plug.

Since the valve plug is seated on a taper seat and is separate from thestem it will always be tight on its seat and remain tight as the springtakes u the wear On'the seat. The stem is seate by the pressure of theHuid and the packing gland on the stem is usedfor additional repackedwhile the -pressure is on the valve. In its use as a'blow-OH the stopcock would soon'become ino erative from themud and sediment from tcompounds used in boilers to prevent incrustations. These will tightlypack into the pressure chamber and also get into the the casing andvalve plug and prevent it from turning. By providing the pressurechamber4 'with a blow-OE I provide means forreadily removing theobstructions and in connection clearance between the inner end of thestem, thus if the pet cock on top of the stem is'opened, the pressurecan sli htly raise the plug from its seat and thus al the sediment andgrit which may causethe plug to stick blown out. L l Y Having thus fullydescribed my invention, what I claim is 1. A stop cock having a facingformed with a frusto-conicalseat chamber provided with an inlet at thesmall end of said chamber and with a lateral outlet therefrom', a hollowconical ,valve Cplug` seated in said chamber, and provide inlet andoutlet o enings the seat chamber extending above t e valve plug andforming a pressure chamber on the top thereof, the top being closed andprovided with a socket and a valve stem extending through the casing andthe pressure chamber into the socket of the valve plug and looselyengaging there' with, .said valve stem being hollow and sepain its seatis also conical valve plug in municating with the safety only and it canbe` e water or from the boiler. lextending above the valve therewith Ileave a small c the top of the valve and with correspondingl rate fromthe valve plu with the pressure cham er through openingsand'communicating i in the stem and the 4pressure chamber communicatingwith the interior of the valve plug through openings in the top thereof.

2. A stop cock having a facing formed with a frusto-conical seatchamber, a hollow saidchamber andf provided with an inlet into itssmaller end`cominlet into the casing and with a lateral outlet adaptedto register with a lateral outlet from the casing, saidvalve plu seatedin the seat chamber independent y Of its stem and with the seat chamberplug and forming a pressure chamber on top t for blowing O through saidpressure chamber, the pressure chamber being in communication with theinterior Of the valve plug.

3. In a stop cock, the combination with the' casing havin AafrustO-conical seat chamber provided wit an inlet into the small end o fthe chamber and with a lateral outlet therefrom, a hollow conical valveplug seated in said chamber and provided with a corresponding inlet andoutlet, the seat chamber extending above the valve plug and forming apressure chamber on top thereof and communicating with the interior ofthe valve plug, a separate valve stem extending through the casing andpressure chamber into t e tO of the plug, said top with a soc et intowhich the va ve stem loosely enga es and a coilspring inclosed in arecess in t e inner end of thel valve stem said valve stem provided-witha valve con. trolled passage therethrough communicating with thepressure chamber on the top of the valve plug for the purpose s ecified.

In testimony whereof I a my signature in-presence of two witnesses.

ROBERT Bicis.

Witnesses:

@Tiro F. BARTHEL, THOMAS G. LONGSTAFF.

ereof and means rovided

